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        From the  
          Structure section  of the action bar, click Split  . The 
          
        Split dialog box appears.
        
          Select a  terrain mesh 
         to split from the Split dialog box.  
        
        
      The  Element to Cut box is updated with your selection.Select  a terrain mesh as a cutting element. The Cutting Element box is updated with your selection.
        Optional: Click Other Side to change the
          orientation.
        
          Note:
    		You can click  to hide or show the selection.
        
          Click Apply.
        
        
        
          The  terrain mesh is  modified and split accordingly.
        A split object appears in the tree.Click OK.
 
      
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